One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(13,14,20,26,19,15,18,23)(16,24,17,25,27,21,28,22)(5,6)(7,10)(8,9)(11,12)(13,15,19,14)(16,21,27,24)(17,25,28,22)(18,23,20,26)(2,4)(6,9)(10,12)(13,16)(14,21)(15,24)(17,20)(18,28)(19,27)(22,26)(23,25) involution — undirected(5,7)(6,10)(8,11)(9,12)(13,17)(14,22)(15,25)(16,18)(19,28)(20,27)(21,23)(24,26) involution — undirected(7,11)(10,12)(16,27)(17,28)(21,24)(22,25) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.